Make Podfiles use symlinks to local pods - #14748

/cc @mit-mit who might like to test this in light of #9502 (comment)

Awesome, cool!
LGTM

I wonder if we can put these symlinks in the /Pods directory to keep them bundled. This way, it 'self documents' too when the users are exploring the directories. Wonder if pod deintegrate would clean up everything nicely for us if it were inside /Pods.

I wonder if we can put these symlinks in the /Pods directory to keep them bundled. This way, it 'self documents' too when the users are exploring the directories. Wonder if pod deintegrate would clean up everything nicely for us if it were inside /Pods.

Yes, I'll give it a try at least. One may worry that we'll be making assumptions about the detailed workings of pod install. Changes to the timing or the extend to which it clears the Pods/ folder could affect correctness down the road.

• Moved Symlinks folder to Pods/.symlinks
• Now copying Flutter framework's LICENSE file to sibling of Flutter framework podspecs in cache. This avoids issue with resolving ../../../../../ relative to symlink.

Awaits merge and roll of flutter-team-archive/engine#4691 which updates the LICENSE placement in Flutter.podspec.

@xster , @jakobr-google PTAL